Method of and device for applying an end winding at the top of wound weft bobbins and cops



June 5, 1962 E. ETIKER 3, 37,7

METHOD OF AND DEVICE F APPLYI AN END WINDING AT 0F WOUND WEFT BO NS AND COPS Filed June 5, 1959 THE TOP INVENTOR.

nited States 3,037,716 METHOD OF AND DEVICE FOR APPLYING AN END WINDING AT THE TGP OF WOUND WEFT ROBBINS AND COPS Ernst Dietiker, Horgen, Zurich, Switzerland, assignor t Maschinenfabrik Schweiter A.G., Hui-gen, Zurich, Switzerland, 3 company of Switzerland Filed June 5, 1959, Ser. No. 818,408 Claims priority, application Switzerland June 10, 1958 8 Claims. (Cl. 24218) It is known that a separate end winding is applied to the end of the weft bobbin after winding on weft pirn winders, particularly if the bobbins are designed for use in looms with automatic bobbin change, so that the be ginning of the yarn can readily be gripped and drawn off by the catcher. The heretofore known end windings have comparatively long yarn ends and above all display the tendency to unwind automatically, particularly where the yarns are smooth. It has been found that the unwound long yarn ends of the weft bobbins arranged in rows on the loom for the purpose of automatic insertion in the shuttle may cause trouble in that the member gripping the unwound portion may catch not only the beginning of one bobbin but also that of one or several more bobbins.

The device and method according to the present invention enables a winding having a very short yarn end to be formed in a very simple manner, said yarn end being prevented from unwinding itself. A particular advantage of the invention resides in the fact that the securing of the end winding is effected without employing a loop. The method according to this invention consists in that the yarn is continuously Wound directly on the bobbin tube at one point of the end winding so that a groove is formed at the center of the winding, the lateral windings of which cover the yarn entering the groove from either side, a member conducting the yarn towards the bobbin tube being employed to form the said groove. The method is performed by means of a device comprising a yarn guide plate, a member forming a groove in the end winding and a checking pin limiting the width of the winding at the side of the bobbin tip. Such an end winding also enables the yarn end to be attached to spinning cops.

An embodiment of the invention is shown in the attached drawing in which:

FIG. 1 is a cross-sectional view taken along line II in FIG. showing the method according to this invention;

FIG. 2 is an end view of the device in operative position from the bobbin side;

FIG. 3 is a plan view of the device;

FIG. 4 shows an end view of the device swivelled into inoperative position;

FIGS. 5 and 6 show an end view respectfully, of the yarn guide during the formation of the end winding, and

FIG. 7 shows a plan view of a completed bobbin with an end winding secured against unwinding.

Applied to the end of the bobbin 1 (FIG. 7) is an end winding 2 from which the yarn end 3 projects by 0.5 to 1 centimetre. The device for the formation of the end winding comprises a holder 4a which may, by way of example, be attached to the counter member 4 of the bobbin support. Rotatably connected to this holder 4m is the spindle 5 to which a one-arm lever 6 is attached by means of a pin 7. Secured to the spindle 5 is a further two-arm lever 8 which carries an adjusting screw 9 at one end 8a and, at the other, a spring eye engaged by a tension spring 10 and a pressure bar 10a which moves the device into operative position. Arranged on the lever and a plan view,

atent 6 is a yarn guide plate 11 in which the checking pin 12 (FIG. 1) is supported and forced downward by the spring 12a. This checking pin 12 is provided with a conical free end 13 which is flared outwards. Screwed to the yarn guide plate 11 by means of screws 15 is a winding separator member 14 so that its edge is directed at the point of entry 11a (FIG. 5) of the supplied yarn 18. This winding separator member forms a groove in the yarn winding and continuously conducts the thread to the bottom of the groove directly to the outer surface of the bobbin member 1. The yarn guide plate 11 and the winding separator member 14 may also be formed integrally. The lever 6 can be so adjusted by the adjusting screw 9 that the winding separator member 14 is removed from the surface of the bobbin tube by one thickness of the yarn while the checking pin 12 has its edge facing the winding lightly engaging the bobbin tube with its conical end under the pressure of spring 12a and is thereby rotated. As best seen in FIGS. 1 and 2, only the edge of the conical end of the checking pin facing the winding engages the tube. This enables it to rotate while protecting both the bobbin and the windings against friction.

The checking pin forms an acute angle with the bobbin surface. Upon completion of the winding 16, the yarn guide 17 is swivelled out of normal winding position towards the end winding device, which has previously been swivelled into operative position (FIG. 2), without interrupting the rotation of the bobbin.

The first group or layers of the end winding are applied on the entry side of the yarn guide plate 11. The yarn 18 passed about the edge of the yarn guide plate 11 is deviated from the yarn windings formed but, owing to its position of entry determined by the yarn guide plate 11 and the yarn tension, always displays the tendency to return to its natural position, i.e. normal to the bobbin axis. The winding so produced, however, very quickly inhibits the spreading of the yarn on this side of the winding separator member, which causes a group or number of layers to be wound on the as yet free side of the winding separator member as well, the individual coils of yarn passing underneath the separator member. This practically eliminates the natural spreading of the yarn so that the yarn further supplied is wound on the bare bobbin tube in the groove formed by the winding separator member at point 11a (FIG. 5). The yarn windings now supplied to this groove are continuously displaced by the additional windings and thereby slipped underneath the windings already present on the surface of the bobbin tube. The supplied yarn 18 is therefore continuously covered. The effect of this covering of the yarn supplied is enhanced by the cone 13 of the stop pin 12 against which the windings moving towards the bobbin end owing to the bobbins conicity abut, thereby being slipped one over the other. Pulling the yarn from under the outer windings requires a relatively strong force so that it cannot automatically unwind itself. It must be taken into consideration that the thread wound on the bobbin tube may be displaced thereon in axial direction of the bobbin tube by the thread subsequently wound up at the same location. Due to this fact it is possible that the thread with its windings on the bobbin tube will form first a winding portion on the side of the yarn guide plate 11, i.e. the separator member 14 nearer the winding 16.

However, once the pressure of the winding on this nearer side is sufiiciently great, the thread will with its subsequent windings escape to the side of the separator member 14 farther from the winding 16, where another winding portion will be built up.

It has been found that despite one yarn winding crossing over from the winding portion on the nearer side to the winding portion on the farther side, the oncoming thread may still enter under the separator member 14. When the winding portion on the farther side of the separator member has been formed which is also of sufficient thickness, the tWo winding portions will have a tendency to press against the sides of the separator member. A few windings of the thread will subsequently still enter under the separator, whereupon winding is stopped. Due to the fact that the separator member 14 is retracted from between the two winding portions, they will, due to their tension, fill the gap or groove between them so that a more or less uniform end winding is formed, in which the thread end of the end winding itself is covered by previously produced windings or turns of the end winding. Thus unwinding of the thread end from the end winding is prevented.

Various changes and modifications may be made without departing from the spirit and scope of the present invention and it is intended that these modifications and changes be embraced by the annexed claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. A device for applying a separate end winding to a bobbin tube comprising a yarn guide plate, a winding separator member affixed to said guide plate for forming a groove in an end winding, and a checking pin resiliently mounted in said guide plate for limiting the width of the end winding on the side of one of the ends of said bobbin tube.

2. A device according to claim 1, including a spring engaging said checking pin, urging the checking pin to engage the bobbin tube under pressure, said checking pin limiting the width of the end winding in the direction towards said one end of said bobbin tube.

3. A device according to claim 2, said checking pin being located and extending at an acute angle to the surface of said bobbin tube end.

4. A device according to claim 1 wherein said checking pin is provided with a conical head provided with an enlarged end face, the edge of said end face engaging the bobbin tube when the end winding is applied.

5. A device according to claim 1, and means movably mounting said yarn guide plate and said winding separator member for movement in a direction towards the bobbin.

6. A method of applying a separate end winding to the the end of wound bobbins and cops comprising the steps of, continuously winding a continuous strand of yarn to form a multiple turn yarn pile adjacent one end of a bobbin while simultaneously maintaining at least the peripheral turns of said pile in separate sections on opposite sides of a recess having side wall portions defined by spaced turns of said pile tensioned for movement toward one another, then directing an incoming end portion of said continuous strand into said recess, while maintaining at least the peripheral turns of said pile in separate sections, and thereafter ceasing to maintain the peripheral turns of said pile in separate sections, whereby said wall portions collapse and at least said spaced turns of said pile move toward one another thereby embedding said end portion of said continuous strand in said pile.

7. In a method of producing an end winding on a bobbin member having a weft winding wound thereon with the tip end of said weft winding spacedfrom one end of said bobbin member, the steps of: continuously winding a continuous strand of yarn to form a multiple turn yarn pile spaced between the tip end of said weft winding and said one end of said bobbin member while simultaneously maintaining at least the peripheral turns of said pile in separate sections on opposite sides of a recess having side wall portions defined by spaced turns of said pile tensioned for movement toward one another, then directing an incoming end portion of said continuous strand into said recess while maintaining at least the peripheral turns of said pile in separate sections, and thereafter ceasing to maintain the peripheral turns of said pile in separate sections, whereby said wall portions collapse and at least said spaced turns of said pile move toward one another thereby embedding said end portion of said continuous strand in said pile.

8. In a method of producing an end winding on a bobbin member having a yarn package wound thereon; the steps of: guiding a continuous yarn strand continuous with said yarn package to a location adjacent one end of said bobbin member and spaced from said yarn package, then continuously winding said yarn strand on said bobbin member at said location and on one side of a separator spaced at a distance from said bobbin member approximately equal to the thickness of said yarn strand to form a first group of stacked yarn windings tensioned for movement toward said separator, thereafter continuing winding of said yarn strand to displace at least some of the previously wound yarn windings along said bobbin member to the other side of said separator to form a second group of stacked yarn windings also tensioned for movement toward said separator and spaced from said first group of yarn windings by said separator, then directing an incoming end portion of said continuous strand toward the tip of said separator adjacent said bobbin member and between said first and second groups of stacked yarn windings, and then withdrawing the separator from between said first and second groups of yarn windings whereby the turns of said yarn strands adjacent said separator move into the space vacated by said separator to form an end winding yarn pile having said end portion of said continuous yarn strand embedded therein.

References Cited in the file of this patent UNITED STATES PATENTS 1,179,459 Ryon Apr. 18, 1916 1,334,427 Wood Mar. 23, 1920 1,572,157 Morrell Feb. 9, 1926 1,614,879 Colman Jan. 18, 1927 2,395,891 Lodge Mar. 5, 1946 2,695,138 Perry Nov. 23, 1954 FOREIGN PATENTS 142,298 Great Britain May 6, 1920 

